2103213421 has 4 divisors (see below), whose sum is σ = 2106645052. Its totient is φ = 2099781792.

The previous prime is 2103213407. The next prime is 2103213457. The reversal of 2103213421 is 1243123012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 309267396 + 1793946025 = 17586^2 + 42355^2 .

It is a cyclic number.

It is not a de Polignac number, because 2103213421 - 2¹¹ = 2103211373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2103217421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1714896 + ... + 1716121.

It is an arithmetic number, because the mean of its divisors is an integer number (526661263).

Almost surely, 2^2103213421 is an apocalyptic number.

It is an amenable number.

2103213421 is a deficient number, since it is larger than the sum of its proper divisors (3431631).

2103213421 is an equidigital number, since it uses as much as digits as its factorization.

2103213421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3431630.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 2103213421 is about 45860.8048446601. The cubic root of 2103213421 is about 1281.2320130539.

Adding to 2103213421 its reverse (1243123012), we get a palindrome (3346336433).

It can be divided in two parts, 21032 and 13421, that added together give a triangular number (34453 = T₂₆₂).

The spelling of 2103213421 in words is "two billion, one hundred three million, two hundred thirteen thousand, four hundred twenty-one".